3.1 The Holographic Method of Contouring of Static …
217
If the polarizer is to be turned anticlockwise, i.e., α < 0, then z > 0 and the
point B(x 2 , y 2 ) are more remote from the observer than the point A(x 1 , y 1 ). The
measurements of the value and direction of the relief can be conducted in each point
of the image through shifting the topographical lines on the surface of the object
under study by turning the polarizer that increases resolution. Meanwhile, the value
of the relief height is estimated by the change of the rotation angle of the polarizer and
by calculations according to (3.50). Thus, the suggested method makes it possible
to move from linear measurements to the angular ones that increase accuracy of the
measurements.
One of the possible versions of the optical scheme of the experimental set-up for
implementation of this method is presented in Fig. 3.18. The immersion method was
used. The shape of the surface of the plastic ball was determined. Firstly, the chamber
with the object 17 was filled with optically neutral medium.
During the first exposure, the hologram was recorded on the photoplate 11 with
a reference beam formed by the beam splitter 6 and the mirror 5.
Fig. 3.18 Optical scheme of the set-up of surface relief contouring based on the change of polarization condition of object waves: 1—the laser; 2, 3, 5, 8—the mirrors; 4—the telescopic system;
6, 16—the light splitters; 7,14—the crystal wafers; 9—the light filters; 10,13—the lenses; 11-—the
hologram; 12—the spacial filter; 15—the polarizer; 17—the camera with prototype system; 18—the
shutters; 19—CCD matrix. Reprinted from [94] with permission
217
If the polarizer is to be turned anticlockwise, i.e., α < 0, then z > 0 and the
point B(x 2 , y 2 ) are more remote from the observer than the point A(x 1 , y 1 ). The
measurements of the value and direction of the relief can be conducted in each point
of the image through shifting the topographical lines on the surface of the object
under study by turning the polarizer that increases resolution. Meanwhile, the value
of the relief height is estimated by the change of the rotation angle of the polarizer and
by calculations according to (3.50). Thus, the suggested method makes it possible
to move from linear measurements to the angular ones that increase accuracy of the
measurements.
One of the possible versions of the optical scheme of the experimental set-up for
implementation of this method is presented in Fig. 3.18. The immersion method was
used. The shape of the surface of the plastic ball was determined. Firstly, the chamber
with the object 17 was filled with optically neutral medium.
During the first exposure, the hologram was recorded on the photoplate 11 with
a reference beam formed by the beam splitter 6 and the mirror 5.
Fig. 3.18 Optical scheme of the set-up of surface relief contouring based on the change of polarization condition of object waves: 1—the laser; 2, 3, 5, 8—the mirrors; 4—the telescopic system;
6, 16—the light splitters; 7,14—the crystal wafers; 9—the light filters; 10,13—the lenses; 11-—the
hologram; 12—the spacial filter; 15—the polarizer; 17—the camera with prototype system; 18—the
shutters; 19—CCD matrix. Reprinted from [94] with permission